A brief outline of the paper is as follows. In Sec. 2, we revisit the well-known features of Weyl invariance and Weyl anomaly in the context of 2d CFTs, in an effort to set notation and set the stage for our explorations of Weyl symmetry in BMS invariant field theories. In Sec. 3, we give a brief review of the BMS algebra and 2d field theories invariant under the BMS\(_3\)  algebra, which we will call BMS field theories or BMSFTs for short. We review some basic notions that we would require for calculations with 2d BMSFTs later in the paper. In Sec. 4, we introduce TT OPEs and delta functions on our Carrollian backgrounds and show how the delta function leads to Ward identities and correlation functions which match and generalise answers in [1]}. Armed with these formulae, we compute the BMS Weyl anomaly in Sec. 5. We conclude with a summary and discussions about current and future directions of further research in Sec. 6. A number of appendices contain more details about our computations that are omitted in the main body of the paper.
